The Atari 400 Mini has niche appeal ... it's compatible with games across all of Atari's 8-bit systems, which includes the 800 (effectively the same computer), 5200, 130XE, and more.

Its keyboard is just for show (much like its older stablemates) but you can play a library of 25 built-in games, not just those released for the 400, but also Atari 800, XL, XE and 5200 titles.